A deuterium atom is a hydrogen with an extra neutron in its nucleus.
重氢是原子核中多一个中子的氢。
But sometimes a cosmic ray will collide with a nitrogen atom, giving it an extra neutron.
但有时宇宙射线会撞击氮原子，赋予它一个额外的中子。
Most current fusion efforts look to combine two atoms of deuterium, a heavier version of hydrogen with an extra neutron.
最流行的聚变做法是将两个氘原子结合在一起——氘是带有一个额外的中子的重氢。
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